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                <h2 id="CSS"><a href="#CSS" class="headerlink" title="CSS"></a>CSS</h2><ol>
<li>概念：Cascading Style Sheets 层叠样式表</li>
</ol>
<span id="more"></span>

<ol start="2">
<li><p>CSS好处</p>
<ol>
<li>功能强大</li>
<li>将内容展示和样式控制分离<ul>
<li>降低耦合度,解耦</li>
<li>让分工协作更容易</li>
<li>提高开发效率</li>
</ul>
</li>
</ol>
</li>
<li><h2 id="CSS的使用-CSS与html结合方式-1-内联样式-在标签内使用style属性指定css代码-如-hello-css-并没有把内容和样式分开-因此不推荐-2-内部样式-在head标签内-定义style标签-style标签的标签体内容就是css代码-Title-div-color-blue-x2F-x2F-被div包裹的内容就会变成蓝色-hello-css-只能设置当前页面被div标记的部分-想把多个页面设置成这样就不适用了-3-外部样式-第一步-定义CSS资源文件-第二步-在head标签内-定义link标签-引入外部的资源文件-一般都放在一个css的文件夹里-后缀名-css-a-css-div-color-green"><a href="#CSS的使用-CSS与html结合方式-1-内联样式-在标签内使用style属性指定css代码-如-hello-css-并没有把内容和样式分开-因此不推荐-2-内部样式-在head标签内-定义style标签-style标签的标签体内容就是css代码-Title-div-color-blue-x2F-x2F-被div包裹的内容就会变成蓝色-hello-css-只能设置当前页面被div标记的部分-想把多个页面设置成这样就不适用了-3-外部样式-第一步-定义CSS资源文件-第二步-在head标签内-定义link标签-引入外部的资源文件-一般都放在一个css的文件夹里-后缀名-css-a-css-div-color-green" class="headerlink" title="CSS的使用:CSS与html结合方式 1. 内联样式 在标签内使用style属性指定css代码,如 hello css 并没有把内容和样式分开,因此不推荐 2. 内部样式 在head标签内,定义style标签,style标签的标签体内容就是css代码           Title              div{             color:blue; &#x2F;&#x2F;被div包裹的内容就会变成蓝色         }        hello css  只能设置当前页面被div标记的部分,想把多个页面设置成这样就不适用了 3. 外部样式 第一步:定义CSS资源文件 第二步:在head标签内,定义link标签,引入外部的资源文件 一般都放在一个css的文件夹里,后缀名.css a.css div{     color:green; }"></a>CSS的使用:CSS与html结合方式<br> 1. 内联样式<br> 在标签内使用style属性指定css代码,如<br> <div style="color:red;">hello css</div><br> 并没有把内容和样式分开,因此不推荐<br><br> 2. 内部样式<br> 在head标签内,定义style标签,style标签的标签体内容就是css代码<br> <head><br>     <meta charset="UTF-8"><br>     <title>Title</title><br>     <style><br>         div{<br>             color:blue; &#x2F;&#x2F;被div包裹的内容就会变成蓝色<br>         }<br>     </style><br><br> </head><br><br> <body><br><br> <div>hello css</div><br> </body><br><br> 只能设置当前页面被div标记的部分,想把多个页面设置成这样就不适用了<br> 3. 外部样式<br> 第一步:定义CSS资源文件<br> 第二步:在head标签内,定义link标签,引入外部的资源文件<br><br> 一般都放在一个css的文件夹里,后缀名.css<br><br> a.css<br> div{<br>     color:green;<br> }</h2><pre><code> &lt;head&gt;
 &lt;meta charset=&quot;UTF-8&quot;&gt;
 &lt;title&gt;Title&lt;/title&gt;
 &lt;link rel=&quot;stylesheet&quot; href=&quot;css/a.css&quot;&gt;
</code></pre>
 </head>
 
 <body>
 
 <div>hello css</div>
 </body>
 ----------------------------------------------
 也可以写成
 <style>
     @import"css/a.css";
 </style>
 ----------------------------------------------
 
</li>
<li><p>CSS语法:</p>
<ul>
<li><p>格式:<br>  选择器{<br>  属性名1:属性值1;<br>  属性名2:属性值2;<br>  ……<br>  }</p>
</li>
<li><p>选择器:筛选具有相似特征的元素<br>  如写上div,所有div就会应用样式,没有写div的就不会改变</p>
</li>
</ul>
</li>
<li><p>选择器:筛选具有相似特征的元素</p>
<ul>
<li>分类:<ol>
<li><pre><code>基本选择器
</code></pre>
<ol>
<li><p>id选择器:选择具体的id属性值的元素<br> 语法:#id属性值()</p>
</li>
<li><p>元素选择器:选择具有相同标签名称的元素<br> 语法:标签名称()<br> 注意:id选择器优先级高于元素选择器</p>
</li>
<li><p>类选择器:选择具有相同的class属性值的元素<br> 语法:.class属性值{}<br> 注意:优先级高于元素选择器,低于id选择器</p>
 <head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style>
     #div1{
         color:red; //只有id为div1的部分才会改变
     }
     
<pre><code> div&#123;
     color:green;   //应用于所有div标记的部分,但id选择器优先级高于元素选择器,所以id选择器部分不会被覆盖
 &#125;
 
 .cls1&#123;
     color:blue;
 &#125;
</code></pre>
<p> </style></p>
</li>
</ol>
 </head>

 <body>

 <div id="div1">hello css</div>
 <div>hello</div>
 
 <p class="cls1">无名剑</p>
 
 </body>
     </li>
<li><p>扩展选择器</p>
<ol>
<li><p>选择所有元素:<br> *语法: *{}</p>
</li>
<li><p>并集选择器:<br> *语法:选择器1,选择器2{}</p>
</li>
<li><p>子选择器:筛选选择器1元素下的选择器2元素<br> *语法:选择器1 选择器2{}</p>
</li>
<li><p>父选择器：筛选选择器2的父选择器1元素<br> *语法：选择器1 &gt; 选择器2{}</p>
</li>
<li><p>属性选择器: 选择元素名称, 属性名&#x3D;属性值的元素<br> *语法: 元素名称[属性名&#x3D;’属性值’]{}</p>
</li>
<li><p>伪类选择器: 选择一些元素具有的状态<br> *语法: 元素:状态{}<br> *如: <a><br> *状态:<br>     link: 初始化的状态<br>     visited: 被访问过的状态<br>     active: 正在访问状态<br>     hover: 鼠标悬浮状态</p>
</li>
</ol>
 <head>
     <meta charset="UTF-8">
     <title>扩展选择器</title>
     <style>
         子选择器, 只有在div下的p标签
         div p{
             color:red;
         }
         
<pre><code>     父选择器, 只有p上的div会变
     div &gt; p&#123;
         border: 1px solid;
     &#125;
     
     属性选择器,只有type符合的才会变
     input[type=&#39;text&#39;]&#123;
         border: 5px solid;
     &#125;
     
     改变超链接各种不同状态的属性
     a:link&#123;
         color:pink
     &#125;
     a:hover&#123;
         color:green
     &#125;
     a:active&#123;
         color:yellow
     &#125;
     a:visited&#123;
         color:red
     &#125;
 &lt;/style&gt;
</code></pre>
 </head>
 <body>

<pre><code> &lt;div&gt;
     &lt;p&gt;无名剑主&lt;/p&gt;
 &lt;/div&gt;

 &lt;p&gt;虎啸飞剑式&lt;/p&gt;

 &lt;div&gt;恒山松岳&lt;/div&gt;

 &lt;input type = &quot;text&quot;&gt;
 &lt;input type = &quot;password&quot;&gt;

 &lt;br&gt;  &lt;br&gt;

 &lt;a href=&quot;#&quot;&gt;洗髓经&lt;/a&gt;
</code></pre>
 </body></li>
</ol>
</li>
</ul>
</li>
<li><p>属性</p>
<ol>
<li>字体, 文本<br> font-size: 字体大小<br> color: 文本颜色<br> text-align: 对齐方式<br> line-height: 行高<br> ……</li>
<li>背景<br> background</li>
<li>边框<br> boder: 边框</li>
<li>尺寸<br> width<br> height</li>
<li>盒子模型: 控制布局<br> margin: 外边距<br> padding: 内边距<br> 默认情况下内边距会影响整个盒子大小<br> 需要设置box-sizing: border-box;<br><br> float: 浮动<br> left<br> right</li>
</ol>
</li>
</ol>
<head>
    <meta charset="UTF-8">
    <title>Title</title>

<pre><code>&lt;style&gt;
    div&#123;
        border: 1px solid red;
        width: 100px
    &#125;

    .div1&#123;
        width: 100px;
        height: 100px;

        /*
        对于内盒,就可以直接设置外边距让其居中
        margin: 50px; */
    &#125;

    .div2&#123;
        width: 200px;
        height: 200px;

        /*
            如果设置外盒内边距,其大小容易改变
            设置合资的属性,让长宽就是最终大小
        */
        padding: 50px;
        box-sizing: border-box;
    &#125;

    .div3&#123;
        float: left;
    &#125;
    .div4&#123;
        float: left;
    &#125;

    .div5&#123;
        float: right;
    &#125;
&lt;/style&gt;
</code></pre>
</head>
<body>

<pre><code>&lt;div class=&quot;div2&quot;&gt;
    &lt;div class=&quot;div1&quot;&gt;&lt;/div&gt;
&lt;/div&gt;

&lt;div class=&quot;div3&quot;&gt;aaaa&lt;/div&gt;
&lt;div class=&quot;div4&quot;&gt;bbbb&lt;/div&gt;
&lt;div class=&quot;div5&quot;&gt;cccc&lt;/div&gt;
</code></pre>
</body>
    
    
<h2 id="CSS案例-注册页面"><a href="#CSS案例-注册页面" class="headerlink" title="CSS案例 注册页面"></a>CSS案例 注册页面</h2><!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>

<pre><code>&lt;style&gt;

    *&#123;
        margin: 0px;
        padding: 0px;
        box-sizing: border-box
    &#125;
    body&#123;
        background: url(&#39;../image/background.jpg&#39;) no-repeat center;
    &#125;


    .rg_layout&#123;
        width: 900px;
        height: 500px;
        border: 5px solid #EEEEEE;
        background-color: white;
        /* 让div水平居中*/
        margin: auto;
        margin-top: 15px;
    &#125;

    .rg_left&#123;

        float: left;
        margin: 15px;
    &#125;

    .rg_left p:first-child&#123;
        color:#FFD026;
        font-size:20px;
    &#125;

    .rg_left p:last-child&#123;
        color:#A6A6A6;
        font-size:20px;
    &#125;

    .rg_center&#123;

        float: left;

        width: 450px;
    &#125;

    .rg_right&#123;

        float: right;
        margin: 15px;
    &#125;

    .rg_right p&#123;
        font-size:15px;
    &#125;

    .rg_right p a&#123;
        color:pink;
    &#125;

    .td_left&#123;
        width: 100px;
        text-align: right;
        height: 45px;
    &#125;

    .td_right&#123;
        padding-left: 50px;

    &#125;


    #user,#password,#email,#name,#tel,#birthday,#checkcode&#123;
        width: 251px;
        height: 32px;
        border: 1px solid #A6A6A6;
        /*设置边框圆角*/
        border-radius: 5px;
        padding-left: 10px

    &#125;

    #checkcode&#123;width:100px;&#125;

    #img_checked&#123;
        width: 100px;
        vertical-align: middle;
    &#125;

    #btn_sub&#123;
        width: 150px;
        height: 40px;
        background-color: #FFD026;
        border: 1px solid #FFD026;
    &#125;

&lt;/style&gt;
</code></pre>
</head>
<body>

<pre><code>&lt;div class=&quot;rg_layout&quot;&gt;
    &lt;div class=&quot;rg_left&quot;&gt;
        &lt;p&gt;新用户注册&lt;/p&gt;
        &lt;p&gt;USER REGISTER&lt;/p&gt;


    &lt;/div&gt;

    &lt;div class=&quot;rg_center&quot;&gt;
        &lt;div class=&quot;rg_form&quot;&gt;
            &lt;form action=&quot;#&quot; method = &quot;post&quot;&gt;
                &lt;table&gt;
                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;user&quot;&gt;用户名&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;text&quot; name=&quot;username&quot; id=&quot;user&quot; placeholder=&quot;请输入用户名&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;password&quot;&gt;密码&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;password&quot; name=&quot;password&quot; id=&quot;password&quot; placeholder=&quot;请输入密码&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;email&quot;&gt;Email&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;email&quot; name=&quot;email&quot; id=&quot;email&quot; placeholder=&quot;请输入邮箱&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;name&quot;&gt;姓名&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;text&quot; name=&quot;name&quot; id=&quot;name&quot; placeholder=&quot;请输入姓名&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;tel&quot;&gt;手机号&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;text&quot; name=&quot;tel&quot; id=&quot;tel&quot; placeholder=&quot;请输入手机号&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;性别&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;radio&quot; name=&quot;gender&quot; value=&quot;male&quot;&gt;男
                            &lt;input type=&quot;radio&quot; name=&quot;gender&quot; value=&quot;female&quot;&gt;女 &lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;birthday&quot;&gt;出生日期&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;date&quot; name=&quot;birthday&quot; id=&quot;birthday&quot; placeholder=&quot;请输入出生日期&quot;&gt;&lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td class=&quot;td_left&quot;&gt;&lt;label for=&quot;checkcode&quot;&gt;验证码&lt;/label&gt;&lt;/td&gt;
                        &lt;td class=&quot;td_right&quot;&gt;&lt;input type=&quot;text&quot; name=&quot;checkcode&quot; id=&quot;checkcode&quot; placeholder=&quot;请输入验证码&quot;&gt;
                            &lt;img id=&quot;img_checked&quot; src=&quot;img/&quot;&gt;
                        &lt;/td&gt;
                    &lt;/tr&gt;

                    &lt;tr&gt;
                        &lt;td colspan=&quot;2&quot; align=&quot;center&quot;&gt;&lt;input type=&quot;submit&quot; value=&quot;注册&quot; id=&quot;btn_sub&quot;&gt; &lt;/td&gt;
                    &lt;/tr&gt;

                &lt;/table&gt;
            &lt;/form&gt;

        &lt;/div&gt;



    &lt;/div&gt;



    &lt;div class=&quot;rg_right&quot;&gt;
        &lt;p&gt;已有账号&lt;a href=&quot;#&quot;&gt;立即登录&lt;/a&gt; &lt;/p&gt;
    &lt;/div&gt;




&lt;/div&gt;
</code></pre>
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